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Bug #1833

UPLINK MCS gets reduced from MCS9->MCS6 when good radio condition exists

Added by arvind.sirsikar about 3 years ago. Updated 2 months ago.

Status:
Feedback
Priority:
High
Assignee:
Target version:
-
Start date:
10/25/2016
Due date:
% Done:

0%

Spec Reference:

Description

During EGPRS UL testing with osmo-trx setup, it is seen that MCS gets reduced very fast even when radio condition is good. Same issue is present for GPRS testing as well.

This condition exists only with osmo-trx setup.


Related issues

Related to OsmoPCU - Bug #3395: Uplink CS/MCS control is broken osmo-pcu is used with osmo-bts-trx/osmo-trxStalled07/14/2018

History

#1 Updated by arvind.sirsikar about 3 years ago

We have modified osmo-pcu.cfg as below

cs link-quality-ranges cs1 6 cs2 5 8 cs3 7 13 cs4 12

TO

cs link-quality-ranges cs1 0 cs2 0 8 cs3 0 13 cs4 0

and validated in integration setup. further investigation needs to be done on how measurement parameter is conveyed between TRX and PCU apart from the usual DATA-IND message

#2 Updated by arvind.sirsikar about 3 years ago

  • Status changed from New to Stalled

#3 Updated by laforge over 2 years ago

#4 Updated by laforge over 2 years ago

  • Status changed from Stalled to New
  • Assignee set to sysmocom

#5 Updated by laforge about 1 year ago

#6 Updated by laforge about 1 year ago

  • Assignee changed from sysmocom to msuraev

#7 Updated by laforge 8 months ago

  • Assignee changed from msuraev to lynxis

#8 Updated by pespin 2 months ago

IIUC this issue was expected until recently when we started providing and fixing (osmo-pcu.git e13cdc503e2faf06699aedd4e84c69ad42916755) measurement values from osmo-trx through osmo-bts-trx into osmo-pcu. fixeria what do you think?

#9 Updated by fixeria 2 months ago

  • Status changed from New to Feedback

IIUC this issue was expected until recently when we started providing and fixing
measurement values from osmo-trx through osmo-bts-trx into osmo-pcu.
fixeria what do you think?

ACK. This should not happen anymore, but we need a TTCN-3 test case to be sure.
arvind.sirsikar, could you please test with the current master and update the issue? Thanks!

#10 Updated by fixeria 2 months ago

  • Related to Bug #3395: Uplink CS/MCS control is broken osmo-pcu is used with osmo-bts-trx/osmo-trx added

#11 Updated by fixeria 2 months ago

BTW, Fairwaves noticed that OsmoTRX computes significantly lower C/I values for EDGE bursts (e.g. 1 dB for 8-PSK vs 8 dB for GMSK). There was a patch somewhere, I'll send it to Gerrit as soon as I find it.

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